Hi, yesterday my YS 63 S, 1 year old, about 30 flights "seized" in mid-air.
Haven't opened the engine yet, but can not turn the prop anymore and when i removed the glow plug it had tiny metallic particels sticking to it. My first guess is that one of the ball bearings is broken, hopefully it didn't destroy the engine which was really running great.

Always looked after the engine very well. Running it on a APC 12x7 and Coolpower Pattern Pro 20% nitro, anything wrong with that ?